Model Lily Cole was one of the last-minute additions to the cast of the St Trinian's remake, which officially began shooting last month. Cole was instantly thrown into the thick of the action, dressed up in a schoolgirl outfit for a scene being shot in London's Trafalgar Square yesterday.

Other late additions include Lena Headey, Celia Imrie and Infamous star Toby Jones. They join a cast that already includes Colin Firth, Stephen Fry and the comedian Russell Brand. Rupert Everett headlines in the dual role as the school's officious headmistress and her dissolute brother. The film is directed by Oliver Parker and Barnaby Thomas.

The St Trinian's stories began life as cartoons by Ronald Searle. The first film, The Belles of St Trinian's, was released in 1954 and spawned three sequels.